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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.category.value_traits"></a><a class="link" href="value_traits.html" title="Type Traits that Describe the Properties of a Type">Type Traits that
      Describe the Properties of a Type</a>
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<dt><span class="section"><a href="value_traits/primary.html">Categorizing
        a Type</a></span></dt>
<dt><span class="section"><a href="value_traits/properties.html">General
        Type Properties</a></span></dt>
<dt><span class="section"><a href="value_traits/relate.html">Relationships
        Between Two Types</a></span></dt>
<dt><span class="section"><a href="value_traits/operators.html">Operator
        Type Traits</a></span></dt>
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<p>
        These traits are all <span class="emphasis"><em>value traits</em></span>, which is to say the
        traits classes all inherit from <a class="link" href="../reference/integral_constant.html" title="integral_constant">integral_constant</a>,
        and are used to access some numerical property of a type. Often this is a
        simple true or false Boolean value, but in a few cases may be some other
        integer value (for example when dealing with type alignments, or array bounds:
        see <code class="computeroutput"><a class="link" href="../reference/alignment_of.html" title="alignment_of">alignment_of</a></code>,
        <code class="computeroutput"><a class="link" href="../reference/rank.html" title="rank">rank</a></code>
        and <code class="computeroutput"><a class="link" href="../reference/extent.html" title="extent">extent</a></code>).
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